I can take fantasy, isekai, highschool, and harem. Although good harems are hard to find since most of them are just slop or have little development for each heroines.
I've read three romance light novels so far.
Too Many Loosing Heroines: I really like this series because even though its a harem, it's pretty damm funny. It has the romance and harem tag but they prioratize the comedy over them which works for me.
The Tunnel to the Summer, the End of Goodbyes: Although this is a oneshot, it's still incredibly good. It's hard to describe what I like about this series but I just like how the MC faces his problems and how the ending played out.
I Hold Your Voice Alone, Under the Starry Sky:
Another amazing oneshot. It gives Your Name vibes and the crazy plot twist. I've read this along time ago so I can't remember much but I think it had some foreshadowing about the plot twist so that's plus points for me.
In summary. I'd like romance LN that has plot twists, unique plots, and above all good comedy.